mybatis @Insert @SelectKey using growth obtained from the primary key value (rpm) insert statement is executed

@Insert(" insert into table(c1,c2) " +
        " values (#{c1},#{c2}) ")
@SelectKey(resultType = long.class,keyColumn = "id",before = false,statement = "SELECT LAST_INSERT_ID() AS id",keyProperty = "id")

int addQuestion(Instance instance);
/** public class Instance{ 
private  long id;
 private String c1;
     private String c2;
}
**/

before = false: Because mysql support from growth in the primary key, it runs the insert statement, then get the primary key value from growth.

      keyColumn: field names from the growth of the primary key

      keyProperty: storing the corresponding entity class field, data type, and attention consistent resultType

     statement: sql statement is actually executed

   There is the value of the entity class SelectKey returned, thread-safe, so regardless of the success of id will be inserted into the safety increment

 

Another good document: HTTPS: //blog.csdn.net/xu1916659422/article/details/77921912
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